West Texas Intermediate dropped for a fourth day, slipping below $100 a barrel, as the dollar headed for its biggest monthly gain against the euro since last February, curbing the appeal of the commodity. Brent decreased in London.

The rice harvest in India, the world’s second-biggest producer, is set to drop from an all-time high as the weakest monsoon in three years slows planting, potentially boosting global prices. Futures climbed for the first time in four days.